/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.dolphinscheduler.plugin.task.seatunnel;

import static org.apache.dolphinscheduler.plugin.task.api.TaskConstants.EXIT_CODE_FAILURE;
import static org.apache.dolphinscheduler.plugin.task.seatunnel.Constants.CONFIG_OPTIONS;

import org.apache.dolphinscheduler.plugin.task.api.AbstractRemoteTask;
import org.apache.dolphinscheduler.plugin.task.api.ShellCommandExecutor;
import org.apache.dolphinscheduler.plugin.task.api.TaskCallBack;
import org.apache.dolphinscheduler.plugin.task.api.TaskConstants;
import org.apache.dolphinscheduler.plugin.task.api.TaskException;
import org.apache.dolphinscheduler.plugin.task.api.TaskExecutionContext;
import org.apache.dolphinscheduler.plugin.task.api.model.Property;
import org.apache.dolphinscheduler.plugin.task.api.model.TaskResponse;
import org.apache.dolphinscheduler.plugin.task.api.parameters.AbstractParameters;
import org.apache.dolphinscheduler.plugin.task.api.parser.ParamUtils;
import org.apache.dolphinscheduler.plugin.task.api.parser.ParameterUtils;

import org.apache.commons.io.FileUtils;
import org.apache.commons.lang3.BooleanUtils;

import java.io.File;
import java.io.IOException;
import java.nio.charset.StandardCharsets;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Map;

/**
 * seatunnel task
 */
public class SeatunnelTask extends AbstractRemoteTask {

  /**
   * seatunnel parameters
   */
  private SeatunnelParameters seatunnelParameters;

  /**
   * shell command executor
   */
  private ShellCommandExecutor shellCommandExecutor;

  /**
   * taskExecutionContext
   */
  protected final TaskExecutionContext taskExecutionContext;

  /**
   * constructor
   *
   * @param taskExecutionContext taskExecutionContext
   */
  public SeatunnelTask(TaskExecutionContext taskExecutionContext) {
    super(taskExecutionContext);

    this.taskExecutionContext = taskExecutionContext;
    this.shellCommandExecutor = new ShellCommandExecutor(this::logHandle,
        taskExecutionContext,
        logger);
  }

  @Override
  public List<String> getApplicationIds() throws TaskException {
    return Collections.emptyList();
  }

  @Override
  public void init() {
    logger.info("SeaTunnel task params {}", taskExecutionContext.getTaskParams());
    if (!seatunnelParameters.checkParameters()) {
      throw new RuntimeException("SeaTunnel task params is not valid");
    }
  }

  // todo split handle to submit and track
  @Override
  public void handle(TaskCallBack taskCallBack) throws TaskException {
    try {
      // construct process
      String command = buildCommand();
      TaskResponse commandExecuteResult = shellCommandExecutor.run(command);
      setExitStatusCode(commandExecuteResult.getExitStatusCode());
      setAppIds(String.join(TaskConstants.COMMA, getApplicationIds()));
      setProcessId(commandExecuteResult.getProcessId());
      seatunnelParameters.dealOutParam(shellCommandExecutor.getVarPool());
    } catch (InterruptedException e) {
      Thread.currentThread().interrupt();
      logger.error("The current SeaTunnel task has been interrupted", e);
      setExitStatusCode(EXIT_CODE_FAILURE);
      throw new TaskException("The current SeaTunnel task has been interrupted", e);
    } catch (Exception e) {
      logger.error("SeaTunnel task error", e);
      setExitStatusCode(EXIT_CODE_FAILURE);
      throw new TaskException("Execute Seatunnel task failed", e);
    }
  }

  @Override
  public void submitApplication() throws TaskException {

  }

  @Override
  public void trackApplicationStatus() throws TaskException {

  }

  @Override
  public void cancelApplication() throws TaskException {
    // cancel process
    try {
      shellCommandExecutor.cancelApplication();
    } catch (Exception e) {
      throw new TaskException("cancel application error", e);
    }
  }

  private String buildCommand() throws Exception {

    List<String> args = new ArrayList<>();
    args.add(seatunnelParameters.getEngine().getCommand());
    args.addAll(buildOptions());

    String command = String.join(" ", args);
    logger.info("SeaTunnel task command: {}", command);

    return command;
  }

  protected List<String> buildOptions() throws Exception {
    List<String> args = new ArrayList<>();
    if (BooleanUtils.isTrue(seatunnelParameters.getUseCustom())) {
      args.add(CONFIG_OPTIONS);
      args.add(buildCustomConfigCommand());
    } else {
      seatunnelParameters.getResourceList().forEach(resourceInfo -> {
        args.add(CONFIG_OPTIONS);
        // TODO Currently resourceName is `/xxx.sh`, it has more `/` and needs to be optimized
        args.add(resourceInfo.getResourceName().substring(1));
      });
    }
    return args;
  }

  protected String buildCustomConfigCommand() throws Exception {
    String config = buildCustomConfigContent();
    String filePath = buildConfigFilePath();
    createConfigFileIfNotExists(config, filePath);

    return filePath;
  }

  private String buildCustomConfigContent() {
    logger.info("raw custom config content : {}", seatunnelParameters.getRawScript());
    String script = seatunnelParameters.getRawScript().replaceAll("\\r\\n", "\n");
    script = parseScript(script);
    return script;
  }

  private String buildConfigFilePath() {
    return String.format("%s/seatunnel_%s.conf", taskExecutionContext.getExecutePath(),
        taskExecutionContext.getTaskAppId());
  }

  private void createConfigFileIfNotExists(String script, String scriptFile) throws IOException {
    logger.info("tenantCode :{}, task dir:{}", taskExecutionContext.getTenantCode(),
        taskExecutionContext.getExecutePath());

    if (!Files.exists(Paths.get(scriptFile))) {
      logger.info("generate script file:{}", scriptFile);

      // write data to file
      FileUtils.writeStringToFile(new File(scriptFile), script, StandardCharsets.UTF_8);
    }
  }

  @Override
  public AbstractParameters getParameters() {
    return seatunnelParameters;
  }

  private String parseScript(String script) {
    // combining local and global parameters
    Map<String, Property> paramsMap = taskExecutionContext.getPrepareParamsMap();
    return ParameterUtils.convertParameterPlaceholders(script, ParamUtils.convert(paramsMap));
  }

  public void setSeatunnelParameters(SeatunnelParameters seatunnelParameters) {
    this.seatunnelParameters = seatunnelParameters;
  }
}
